CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
Once you’re engaged on your BCMSN Examination with your method to CCNP certification, you’ll read through at duration about how Cisco routers and multilayer switches can operate to supply router redundancy – but there’s A further practical services, Server Load Balancing, that does exactly the same for servers. While HSRP, VRRP, and CLBP all symbolize a number of Bodily routers to hosts as only one Digital router, SLB signifies many physical servers to hosts as an individual virtual server.
In the subsequent instance, three Bodily servers happen to be positioned in to the SRB group ServFarm. They’re represented to the hosts given that the Digital server 210.1.one.fourteen.
The hosts will seek to communicate with the server at 210.one.1.fourteen, not understanding that they’re in fact communicating Together with the routers in ServFarm. This enables fast cutover if one of the Bodily servers goes down, as well as serves to cover the particular IP addresses on the servers in ServFarm.
The basic operations of SLB includes making the server farm, accompanied by generating the virtual server. We’ll to start with insert 210.one.1.11 towards the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# serious 210.one.one.eleven
MLS(config-slb-true)# inservice
The first command generates the server farm, with the true command specifying the IP deal with of the real server. The inservice command is required by SLB to consider the server as All set to take care of the server farm’s workload. The real and inservice commands need to be repeated for each server in the server farm.
To produce the virtual server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# Digital 210.1.one.fourteen
MLS(config-slb-vserver)# inservice
In the major down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The Digital server is assigned the IP tackle 210.1.1.14, and connections are permitted once the inservice command is applied.
You might also want to regulate which 토토사이트 of the network hosts can hook up with the Digital server. If hosts or subnets are named While using the consumer command, These would be the only purchasers that may connect with the Digital server. Notice this command utilizes wildcard masks. The subsequent configuration would let only the hosts about the subnet 210.1.one.0 /24 to hook up with the Digital server.
MLS(config-slb-vserver)# shopper 210.one.one.0 0.0.0.255
SLB could be the server close’s answer to HSRP, VRRP, and GLBP – but you still really need to know it to become a CCNP! Being aware of redundancy procedures and protocols is significant in right now’s networks, so be sure to’re at ease with SLB in advance of taking up the Test.